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RE: Import Outlook Emails from OST file to Office 365
As you can see that there is no manual method to migrate OST file to Office 365 mailboxes. But you can also use a third-party tool and there are many third-parties available, MailsDaddy OST to Office 365 Migration Tool is one of them.
For more details you can visit: http://www.osttooffice365.com/